The chemical symbol for arsenic is As. This element is classified as a metalloid, situated in group 15 of the periodic table. Arsenic has various allotropes and is primarily known for its usage in industry, though it is also infamous for its toxicity and historical association with poison. Naturally occurring in minerals, it can contaminate groundwater, leading to serious health hazards when ingested. Arsenic's chemical properties enable its application in semiconductors, pesticides, and herbicides, while it is also studied in relation to its effects on human health and environmental safety.